Sedimentary facies of the lower bitumen-bearing sandstone member of the Silurian Kepingtage Formation in the S1 well area, Tarim Basin
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摘要: 在岩心观察的基础上,通过对岩石学特征、粒度、沉积构造、微量元素、测井和地震等资料的综合分析,对塔里木盆地S1井区志留系柯坪塔格组下沥青砂岩段沉积相进行了研究。认为本区该套地层主要发育受潮汐影响的辫状河三角洲前缘亚相。进一步可识别出水下分流河道、支流间湾、河口砂坝等沉积微相。结合地震属性资料,分析了研究区沉积相平面分布特征。水下分流河道微相砂体储集物性最好,河道的多期迁移、纵横向叠置形成了大面积分布的良好储集体。
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关键词:
- 潮汐影响的辫状河三角洲 /
- 沉积特征 /
- 志留系 /
- 下沥青砂岩段 /
- 塔里木盆地
Abstract: The sedimentary facies of the lower bitumen-bearing sandstone member of the Silurian Kepingtage Formation in the S1 well area, Tarim Basin are discriminated on the basis of core examination, lithology, grain size analysis, sedimentary structures, trace element analysis, well logs and seismic data. The lower bitumen-bearing sandstone member of the Kepingtage Formation is mainly composed of the tidal-influenced braided delta front subfacies, and may be subdivided into the subaqueous distributary channel, interdistributary bay and channel mouth bar microfacies. The planar distribution of the sedimentary facies is delineated in terms of seismic data. The migration and longitudinal and horizontal superimposition of the multistage channels led to the widespread distribution of excellent reservoir rocks, and to the best reservoir quality of the subaqueous distributary channel sandstones. The new insights in this study may provide new geological basic data for the further petroleum exploration and development in the study area. -
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